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THAT IS NOT ALL ...
Apart from mirroring the fuel injection pulses, it also monitors the duty cycle and converted it to 0-5Volt analogue voltage for the purposes of data logging or you just want to know if your stock injectors has maxed out.
Two LEDs is mounted on the top side of the box. The green LED indicates successful detection of fuel injection pulses and the red LED lights up when water in being injected ( preset manifold pressure is reached).